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Finding the Fourth Proportional to 1,210.83, 1,671.21 and 713.85

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Solution

The fourth proportional to 1,210.83, 1,671.21 and 713.85 is: 985.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,210.83 : 1,671.21 = 713.85 : x
  2. Step 2: Convert to fraction form
    1,210.83/1,671.21 = 713.85/x
  3. Step 3: Cross multiply
    1,210.83x = 1,671.21 × 713.85
  4. Step 4: Simplify right side
    1,210.83x = 1,192,993.26
  5. Step 5: Solve for x
    x = 1,192,993.26/1,210.83
  6. Step 6: Final answer
    x = 985.27

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.